Orange lake dye and process of making same.



-To all whom it may concern:

UNITED STATES PATENT OFFICE RICHARD LAUGH, OF BERLIN, GERMANY, ASSIGNOR TO ACTIEN GESELLSCHAFT ANILIN FABRIKATION, OF BERLIN, GERMANY.

ORANGE LAKE DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Application filed September 28,- 1908. Serial No. 4 155,188.

Be it known that I, RICHARD LAUGH, a subject of the German Emperor, residing at Berlin} Germany, and whose post-ofiice ad dress is Am Karlsbad 20., have invented certainnew and useful'lrnprovements in New Orange Lake Dyestufl and Processes of MakingSame; of which the following is a specification.

My invention relates to a monoazo-dyestufi which is suitable for the production of color-lakes'and is based on the observation that the dyestufi which may be obtained by combining the diazo-compound of orthoparadinitroanilin (NH 7N0 :NO 2 1 :2 :4) with beta-naphthol isespecially ada ted for color-lakes. Thus when the dyestu isvprecipitated on a lake base such as for instance aluminium hydrate or barium sulfate or aluminium hydrate in combination with-barium sulfate alake is obtained which shows a brilliant orange shade, which is very fast to light and fast to lime and possesses-a verygreat body, 01. e. an excellent coveringpower; furthermore the dyestufi as well as the lakes are insoluble in oil and can be well varnished over. The dye or the lake may therefore be used for exam le as wall-paper color, printing color or oil co or.

The following example illustrates the invention, the parts being by weight:

Example: The diazo compound formed from 18.3 arts of orthopara-dinitroanilin is introduced while stirring well into 14 parts of finely divided, beta-naphthol, repared for instance by dissolvin B it in anal ah and precipitating in the co (1 by the addition of hydrochloric'acid. The combination should occur at a tem erature of 0 0., the formation of the.

,a powder of a,v

which is insoluble in wat er,-alcohol,idiluted yestufi beginning at once After about 12 hours the mass is slightly heated and the dyestuff isolated by draining and Washing, obtaining thus a-paste' of avery brilliant orange shade which may directly be gsedl for the manufacture of lakes or may be me I i The new nionoazo-dyestufi obtained as ,above forms infthe dry-state a very brilliant orange colored" 'owder insoluble in water,- alcohol, diluted hydrochloric acid and diluted soda-lye. In concentrated sulfuric acid it dissolves to a cherry-red colored solution which on the addition of ice separates red By the action of strong reducing agents the dyestufl is split up yielding 2.4-dini'troanilin besides; I .2-amido-naphtho ,Now what I claim is;+ v

As a new article of manufacture a new orange monoazo-dyestufi which can be obtained by diazotizing ortho-para-dinitroanilin (NH,:NO,':NO,=1:2:4) and combining the diam-compound thus obtained with beta-na hthol, and which dyestufi is espe-- oially a apted for the manufacture of lakes, this coloring-matter forming in the dry state brilliant 'or'ange shade,

hydrochloric acid and diluted soda-lye, but which dissolves in concentrated sulfuric acid to a cherry-red solution which solution on the nesses.

' RICHARD LAUGH.

Witnesses: HENRY 'HASPER,

WOLDEMAR. 

